/**
 * Talaba interfeysi — oq / ko‘k minimalist
 */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --success: #16A34A;
  --warning: #D97706;
  --danger: #DC2626;
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.55;
  min-height: 100vh;
}

a {
  color: var(--primary);
}

.hero {
  text-align: center;
  padding: 2.5rem 1.25rem 1.5rem;
  background: linear-gradient(160deg, #EFF6FF 0%, var(--surface) 45%);
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--primary-dark);
  font-weight: 700;
}

.hero-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--surface);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.motivation {
  max-width: 520px;
  margin: 2rem auto 0;
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.motivation p {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--text-main);
}

.motivation p:last-child {
  margin-bottom: 0;
}

.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up.delay-1 { animation-delay: 0.12s; }
.fade-in-up.delay-2 { animation-delay: 0.24s; }
.fade-in-up.delay-3 { animation-delay: 0.36s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-login {
  max-width: 380px;
  margin: 2rem auto 0;
  padding: 1.75rem;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-login label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.card-login input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card-login input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.card-login input.is-error {
  border-color: var(--danger);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
  transition: background 0.2s, transform 0.15s;
}

.btn:hover {
  background: var(--primary-dark);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.spinner {
  width: 1.1rem;
  height: 1.1rem;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.btn.loading .spinner {
  display: inline-block;
}

.btn.loading .btn-text {
  opacity: 0.9;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.alert-error {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
  border-radius: 10px;
  font-size: 0.9rem;
  display: none;
}

.alert-error.visible {
  display: block;
}

.banner-welcome {
  background: linear-gradient(90deg, #DBEAFE, #EFF6FF);
  border: 1px solid #BFDBFE;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.banner-welcome h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  color: var(--primary-dark);
}

.banner-welcome p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-main);
}

.teachers-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .teachers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.teacher-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.teacher-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.teacher-card.done {
  cursor: default;
  opacity: 0.85;
  border-color: #BBF7D0;
  background: #F0FDF4;
}

.teacher-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.teacher-card .meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.teacher-card .badge-done {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--success);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 100;
  display: none;
  align-items: flex-end;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.open {
  display: flex;
}

@media (min-width: 640px) {
  .modal-overlay {
    align-items: center;
  }
}

.modal-box {
  background: var(--surface);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  animation: fadeInUp 0.35s ease;
}

.modal-box h3 {
  margin: 0 0 0.25rem;
}

.modal-box .sub {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.criterion-row {
  margin-bottom: 1rem;
}

.criterion-row .cname {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.stars {
  display: flex;
  gap: 0.25rem;
}

.star-btn {
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  line-height: 0;
  transition: transform 0.15s;
}

.star-btn svg {
  width: 32px;
  height: 32px;
  display: block;
}

.star-btn:hover {
  transform: scale(1.2);
}

.star-btn path {
  fill: #E2E8F0;
  stroke: #CBD5E1;
  stroke-width: 1;
}

.star-btn.active path,
.star-btn.hover path {
  fill: #FBBF24;
  stroke: #D97706;
}

textarea.eval-comment {
  width: 100%;
  min-height: 90px;
  padding: 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-family: inherit;
  margin-top: 0.5rem;
  resize: vertical;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.25rem;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--border);
}

button.btn-secondary {
  display: inline-flex;
  width: auto;
  padding: 0.5rem 1rem;
  font-weight: 600;
}

.btn-secondary:hover {
  background: var(--bg);
}

.completion-screen {
  display: none;
  text-align: center;
  padding: 2.5rem 1.25rem;
}

.completion-screen.visible {
  display: block;
  animation: fadeInUp 0.6s ease;
}

.completion-screen .big {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  animation: pulse 1.5s ease infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 200;
}

.app-main {
  display: none;
}

.app-main.visible {
  display: block;
}

.login-only {
  display: block;
}

body.state-logged .login-only {
  display: none;
}

body.state-logged .app-main {
  display: block;
}

.footer-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2rem;
}

.meta {
  font-size: 0.9rem;
  color: var(--text-muted);
}